/*
 * Copyright (c) 1999, 2000, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package java.util.regex;


/**
 * Utility class that implements the standard C ctype functionality.
 *
 * @author Hong Zhang
 */

final class ASCII {

    static final int UPPER = 0x00000100;

    static final int LOWER = 0x00000200;

    static final int DIGIT = 0x00000400;

    static final int SPACE = 0x00000800;

    static final int PUNCT = 0x00001000;

    static final int CNTRL = 0x00002000;

    static final int BLANK = 0x00004000;

    static final int HEX = 0x00008000;

    static final int UNDER = 0x00010000;

    static final int ASCII = 0x0000FF00;

    static final int ALPHA = (UPPER | LOWER);

    static final int ALNUM = (UPPER | LOWER | DIGIT);

    static final int GRAPH = (PUNCT | UPPER | LOWER | DIGIT);

    static final int WORD = (UPPER | LOWER | UNDER | DIGIT);

    static final int XDIGIT = (HEX);

    private static final int[] ctype = new int[]{
            CNTRL,                  /* 00 (NUL) */
            CNTRL,                  /* 01 (SOH) */
            CNTRL,                  /* 02 (STX) */
            CNTRL,                  /* 03 (ETX) */
            CNTRL,                  /* 04 (EOT) */
            CNTRL,                  /* 05 (ENQ) */
            CNTRL,                  /* 06 (ACK) */
            CNTRL,                  /* 07 (BEL) */
            CNTRL,                  /* 08 (BS)  */
            SPACE + CNTRL + BLANK,      /* 09 (HT)  */
            SPACE + CNTRL,            /* 0A (LF)  */
            SPACE + CNTRL,            /* 0B (VT)  */
            SPACE + CNTRL,            /* 0C (FF)  */
            SPACE + CNTRL,            /* 0D (CR)  */
            CNTRL,                  /* 0E (SI)  */
            CNTRL,                  /* 0F (SO)  */
            CNTRL,                  /* 10 (DLE) */
            CNTRL,                  /* 11 (DC1) */
            CNTRL,                  /* 12 (DC2) */
            CNTRL,                  /* 13 (DC3) */
            CNTRL,                  /* 14 (DC4) */
            CNTRL,                  /* 15 (NAK) */
            CNTRL,                  /* 16 (SYN) */
            CNTRL,                  /* 17 (ETB) */
            CNTRL,                  /* 18 (CAN) */
            CNTRL,                  /* 19 (EM)  */
            CNTRL,                  /* 1A (SUB) */
            CNTRL,                  /* 1B (ESC) */
            CNTRL,                  /* 1C (FS)  */
            CNTRL,                  /* 1D (GS)  */
            CNTRL,                  /* 1E (RS)  */
            CNTRL,                  /* 1F (US)  */
            SPACE + BLANK,            /* 20 SPACE */
            PUNCT,                  /* 21 !     */
            PUNCT,                  /* 22 "     */
            PUNCT,                  /* 23 #     */
            PUNCT,                  /* 24 $     */
            PUNCT,                  /* 25 %     */
            PUNCT,                  /* 26 &     */
            PUNCT,                  /* 27 '     */
            PUNCT,                  /* 28 (     */
            PUNCT,                  /* 29 )     */
            PUNCT,                  /* 2A *     */
            PUNCT,                  /* 2B +     */
            PUNCT,                  /* 2C ,     */
            PUNCT,                  /* 2D -     */
            PUNCT,                  /* 2E .     */
            PUNCT,                  /* 2F /     */
            DIGIT + HEX + 0,            /* 30 0     */
            DIGIT + HEX + 1,            /* 31 1     */
            DIGIT + HEX + 2,            /* 32 2     */
            DIGIT + HEX + 3,            /* 33 3     */
            DIGIT + HEX + 4,            /* 34 4     */
            DIGIT + HEX + 5,            /* 35 5     */
            DIGIT + HEX + 6,            /* 36 6     */
            DIGIT + HEX + 7,            /* 37 7     */
            DIGIT + HEX + 8,            /* 38 8     */
            DIGIT + HEX + 9,            /* 39 9     */
            PUNCT,                  /* 3A :     */
            PUNCT,                  /* 3B ;     */
            PUNCT,                  /* 3C <     */
            PUNCT,                  /* 3D =     */
            PUNCT,                  /* 3E >     */
            PUNCT,                  /* 3F ?     */
            PUNCT,                  /* 40 @     */
            UPPER + HEX + 10,           /* 41 A     */
            UPPER + HEX + 11,           /* 42 B     */
            UPPER + HEX + 12,           /* 43 C     */
            UPPER + HEX + 13,           /* 44 D     */
            UPPER + HEX + 14,           /* 45 E     */
            UPPER + HEX + 15,           /* 46 F     */
            UPPER + 16,               /* 47 G     */
            UPPER + 17,               /* 48 H     */
            UPPER + 18,               /* 49 I     */
            UPPER + 19,               /* 4A J     */
            UPPER + 20,               /* 4B K     */
            UPPER + 21,               /* 4C L     */
            UPPER + 22,               /* 4D M     */
            UPPER + 23,               /* 4E N     */
            UPPER + 24,               /* 4F O     */
            UPPER + 25,               /* 50 P     */
            UPPER + 26,               /* 51 Q     */
            UPPER + 27,               /* 52 R     */
            UPPER + 28,               /* 53 S     */
            UPPER + 29,               /* 54 T     */
            UPPER + 30,               /* 55 U     */
            UPPER + 31,               /* 56 V     */
            UPPER + 32,               /* 57 W     */
            UPPER + 33,               /* 58 X     */
            UPPER + 34,               /* 59 Y     */
            UPPER + 35,               /* 5A Z     */
            PUNCT,                  /* 5B [     */
            PUNCT,                  /* 5C \     */
            PUNCT,                  /* 5D ]     */
            PUNCT,                  /* 5E ^     */
            PUNCT | UNDER,            /* 5F _     */
            PUNCT,                  /* 60 `     */
            LOWER + HEX + 10,           /* 61 a     */
            LOWER + HEX + 11,           /* 62 b     */
            LOWER + HEX + 12,           /* 63 c     */
            LOWER + HEX + 13,           /* 64 d     */
            LOWER + HEX + 14,           /* 65 e     */
            LOWER + HEX + 15,           /* 66 f     */
            LOWER + 16,               /* 67 g     */
            LOWER + 17,               /* 68 h     */
            LOWER + 18,               /* 69 i     */
            LOWER + 19,               /* 6A j     */
            LOWER + 20,               /* 6B k     */
            LOWER + 21,               /* 6C l     */
            LOWER + 22,               /* 6D m     */
            LOWER + 23,               /* 6E n     */
            LOWER + 24,               /* 6F o     */
            LOWER + 25,               /* 70 p     */
            LOWER + 26,               /* 71 q     */
            LOWER + 27,               /* 72 r     */
            LOWER + 28,               /* 73 s     */
            LOWER + 29,               /* 74 t     */
            LOWER + 30,               /* 75 u     */
            LOWER + 31,               /* 76 v     */
            LOWER + 32,               /* 77 w     */
            LOWER + 33,               /* 78 x     */
            LOWER + 34,               /* 79 y     */
            LOWER + 35,               /* 7A z     */
            PUNCT,                  /* 7B {     */
            PUNCT,                  /* 7C |     */
            PUNCT,                  /* 7D }     */
            PUNCT,                  /* 7E ~     */
            CNTRL,                  /* 7F (DEL) */
    };

    static int getType(int ch) {
        return ((ch & 0xFFFFFF80) == 0 ? ctype[ch] : 0);
    }

    static boolean isType(int ch, int type) {
        return (getType(ch) & type) != 0;
    }

    static boolean isAscii(int ch) {
        return ((ch & 0xFFFFFF80) == 0);
    }

    static boolean isAlpha(int ch) {
        return isType(ch, ALPHA);
    }

    static boolean isDigit(int ch) {
        return ((ch - '0') | ('9' - ch)) >= 0;
    }

    static boolean isAlnum(int ch) {
        return isType(ch, ALNUM);
    }

    static boolean isGraph(int ch) {
        return isType(ch, GRAPH);
    }

    static boolean isPrint(int ch) {
        return ((ch - 0x20) | (0x7E - ch)) >= 0;
    }

    static boolean isPunct(int ch) {
        return isType(ch, PUNCT);
    }

    static boolean isSpace(int ch) {
        return isType(ch, SPACE);
    }

    static boolean isHexDigit(int ch) {
        return isType(ch, HEX);
    }

    static boolean isOctDigit(int ch) {
        return ((ch - '0') | ('7' - ch)) >= 0;
    }

    static boolean isCntrl(int ch) {
        return isType(ch, CNTRL);
    }

    static boolean isLower(int ch) {
        return ((ch - 'a') | ('z' - ch)) >= 0;
    }

    static boolean isUpper(int ch) {
        return ((ch - 'A') | ('Z' - ch)) >= 0;
    }

    static boolean isWord(int ch) {
        return isType(ch, WORD);
    }

    static int toDigit(int ch) {
        return (ctype[ch & 0x7F] & 0x3F);
    }

    static int toLower(int ch) {
        return isUpper(ch) ? (ch + 0x20) : ch;
    }

    static int toUpper(int ch) {
        return isLower(ch) ? (ch - 0x20) : ch;
    }

}
